Allied Furnace: Intake piping for non-direct vent installations (air from indoors)

Intake piping for non-direct vent installations (air from indoors) on a Allied furnace: On a non-direct vent install, the furnace takes its combustion air from the room, so the air intake pipe is really just a protected opening. Before relying on indoor air, think about what is in it. Dust, laundry chemicals, paint fumes or insulation fibres can damage components and foul the burners. The Combustion, Dilution and Ventilation Air guidelines apply here, and the room must meet them before the furnace is fired.

Homeowner with a furnace problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

Applies to: Non-direct vent installations, upflow and horizontal

Common causes of intake piping for non-direct vent installations (air from indoors)

• Dirty or chemical-laden indoor air drawn into the burner
• Intake opening too close to the floor, a platform or a wall
• Loose insulation or debris clogging the intake screen
• Room too tight to supply enough combustion air

How to fix intake piping for non-direct vent installations (air from indoors): step by step

1. Check the room first against the Combustion, Dilution and Ventilation Air guidelines before routing any pipe.
2. Use field-supplied materials and the factory air intake screen to route the intake piping as shown in figure 26 or 27.
3. Keep at least 3 in. (76 mm) clear around the air intake opening.
4. In upflow, point the intake opening forward or to either side.
5. In horizontal, point the intake opening straight out (preferred) or down.
6. Keep the intake away from the floor or a platform so it is not obstructed.
7. Keep loose insulation or other debris away from the screen.
8. Use a sheet metal screw on the intake pipe connector if desired.

If the unit shows an error code, look it up: Allied Furnace codes

Models

92G1UH92G1UH0450892G1UH0451292G1UH0700892G1UH0701292G1UH0901292G1UH0901692G1UH1101692G1UH1102092G1UH1352095G1UHA93UHA95UH